package net.minecraft.world.gen;
import java.util.Random;
public class NoiseGeneratorPerlin extends NoiseGenerator
{
private int[] permutations;
public double xCoord;
public double yCoord;
public double zCoord;
public NoiseGeneratorPerlin()
{
this(new Random());
}
public NoiseGeneratorPerlin(Random par1Random)
{
this.permutations = new int[512];
this.xCoord = par1Random.nextDouble() * 256.0D;
this.yCoord = par1Random.nextDouble() * 256.0D;
this.zCoord = par1Random.nextDouble() * 256.0D;
int var2;
for (var2 = 0; var2 < 256; this.permutations[var2] = var2++)
{
;
}
for (var2 = 0; var2 < 256; ++var2)
{
int var3 = par1Random.nextInt(256 - var2) + var2;
int var4 = this.permutations[var2];
this.permutations[var2] = this.permutations[var3];
this.permutations[var3] = var4;
this.permutations[var2 + 256] = this.permutations[var2];
}
}
public final double lerp(double par1, double par3, double par5)
{
return par3 + par1 * (par5 - par3);
}
public final double func_76309_a(int par1, double par2, double par4)
{
int var6 = par1 & 15;
double var7 = (double)(1 - ((var6 & 8) >> 3)) * par2;
double var9 = var6 < 4 ? 0.0D : (var6 != 12 && var6 != 14 ? par4 : par2);
return ((var6 & 1) == 0 ? var7 : -var7) + ((var6 & 2) == 0 ? var9 : -var9);
}
public final double grad(int par1, double par2, double par4, double par6)
{
int var8 = par1 & 15;
double var9 = var8 < 8 ? par2 : par4;
double var11 = var8 < 4 ? par4 : (var8 != 12 && var8 != 14 ? par6 : par2);
return ((var8 & 1) == 0 ? var9 : -var9) + ((var8 & 2) == 0 ? var11 : -var11);
}
/**
* pars: noiseArray , xOffset , yOffset , zOffset , xSize , ySize , zSize , xScale, yScale , zScale , noiseScale.
* noiseArray should be xSize*ySize*zSize in size
*/
public void populateNoiseArray(double[] par1ArrayOfDouble, double par2, double par4, double par6, int par8, int par9, int par10, double par11, double par13, double par15, double par17)
{
int var19;
int var22;
double var31;
double var35;
double var38;
int var37;
double var42;
int var40;
int var41;
int var10001;
int var77;
if (par9 == 1)
{
boolean var66 = false;
boolean var65 = false;
boolean var21 = false;
boolean var67 = false;
double var72 = 0.0D;
double var71 = 0.0D;
var77 = 0;
double var74 = 1.0D / par17;
for (int var30 = 0; var30 < par8; ++var30)
{
var31 = par2 + (double)var30 * par11 + this.xCoord;
int var78 = (int)var31;
if (var31 < (double)var78)
{
--var78;
}
int var34 = var78 & 255;
var31 -= (double)var78;
var35 = var31 * var31 * var31 * (var31 * (var31 * 6.0D - 15.0D) + 10.0D);
for (var37 = 0; var37 < par10; ++var37)
{
var38 = par6 + (double)var37 * par15 + this.zCoord;
var40 = (int)var38;
if (var38 < (double)var40)
{
--var40;
}
var41 = var40 & 255;
var38 -= (double)var40;
var42 = var38 * var38 * var38 * (var38 * (var38 * 6.0D - 15.0D) + 10.0D);
var19 = this.permutations[var34] + 0;
int var64 = this.permutations[var19] + var41;
int var69 = this.permutations[var34 + 1] + 0;
var22 = this.permutations[var69] + var41;
var72 = this.lerp(var35, this.func_76309_a(this.permutations[var64], var31, var38), this.grad(this.permutations[var22], var31 - 1.0D, 0.0D, var38));
var71 = this.lerp(var35, this.grad(this.permutations[var64 + 1], var31, 0.0D, var38 - 1.0D), this.grad(this.permutations[var22 + 1], var31 - 1.0D, 0.0D, var38 - 1.0D));
double var79 = this.lerp(var42, var72, var71);
var10001 = var77++;
par1ArrayOfDouble[var10001] += var79 * var74;
}
}
}
else
{
var19 = 0;
double var20 = 1.0D / par17;
var22 = -1;
boolean var23 = false;
boolean var24 = false;
boolean var25 = false;
boolean var26 = false;
boolean var27 = false;
boolean var28 = false;
double var29 = 0.0D;
var31 = 0.0D;
double var33 = 0.0D;
var35 = 0.0D;
for (var37 = 0; var37 < par8; ++var37)
{
var38 = par2 + (double)var37 * par11 + this.xCoord;
var40 = (int)var38;
if (var38 < (double)var40)
{
--var40;
}
var41 = var40 & 255;
var38 -= (double)var40;
var42 = var38 * var38 * var38 * (var38 * (var38 * 6.0D - 15.0D) + 10.0D);
for (int var44 = 0; var44 < par10; ++var44)
{
double var45 = par6 + (double)var44 * par15 + this.zCoord;
int var47 = (int)var45;
if (var45 < (double)var47)
{
--var47;
}
int var48 = var47 & 255;
var45 -= (double)var47;
double var49 = var45 * var45 * var45 * (var45 * (var45 * 6.0D - 15.0D) + 10.0D);
for (int var51 = 0; var51 < par9; ++var51)
{
double var52 = par4 + (double)var51 * par13 + this.yCoord;
int var54 = (int)var52;
if (var52 < (double)var54)
{
--var54;
}
int var55 = var54 & 255;
var52 -= (double)var54;
double var56 = var52 * var52 * var52 * (var52 * (var52 * 6.0D - 15.0D) + 10.0D);
if (var51 == 0 || var55 != var22)
{
var22 = var55;
int var68 = this.permutations[var41] + var55;
int var73 = this.permutations[var68] + var48;
int var70 = this.permutations[var68 + 1] + var48;
int var76 = this.permutations[var41 + 1] + var55;
var77 = this.permutations[var76] + var48;
int var75 = this.permutations[var76 + 1] + var48;
var29 = this.lerp(var42, this.grad(this.permutations[var73], var38, var52, var45), this.grad(this.permutations[var77], var38 - 1.0D, var52, var45));
var31 = this.lerp(var42, this.grad(this.permutations[var70], var38, var52 - 1.0D, var45), this.grad(this.permutations[var75], var38 - 1.0D, var52 - 1.0D, var45));
var33 = this.lerp(var42, this.grad(this.permutations[var73 + 1], var38, var52, var45 - 1.0D), this.grad(this.permutations[var77 + 1], var38 - 1.0D, var52, var45 - 1.0D));
var35 = this.lerp(var42, this.grad(this.permutations[var70 + 1], var38, var52 - 1.0D, var45 - 1.0D), this.grad(this.permutations[var75 + 1], var38 - 1.0D, var52 - 1.0D, var45 - 1.0D));
}
double var58 = this.lerp(var56, var29, var31);
double var60 = this.lerp(var56, var33, var35);
double var62 = this.lerp(var49, var58, var60);
var10001 = var19++;
par1ArrayOfDouble[var10001] += var62 * var20;
}
}
}
}
}
}